Research Article
Environmentally Smart Nitrogen Performance in Northern Great Plains’ Spring Wheat Production Systems
Table 1
Initial soil chemical properties (0–30 cm), growing conditions, and summary of field activities at Conrad, Corvallis, and Kalispell, MT, in 2011–2013.
| | Field activity | 2011 | 2012
Conrad | 2013 |
| | Herbicide | GoldSky | GoldSky, Huskie | GoldSky, Huskie | | Herbicide date | May 31 | May 16 | May 23 | | Sensing date | June 15 | May 18 | May 13 | | Topdress N date | June 15 | May 21 | May 14 | | Harvest date | August 30 | August 16 | September 10 | | Soil test N, kg ha−1 | 22 | 56 | 51 | | Soil P, ppm (Olson) | 18 | 12 | 32 | | Soil K, ppm | 221 | 152 | 234 | | Organic matter, % | 1.5 | 1.2
Corvallis | 1.8 |
| | Herbicide | Bronate, Axial XL | Bronate, Axial XL | Supremacy, Axial XL | | Herbicide date | June 13 | May 28 | May 28 | | Sensing date | June 15 | June 8 | June 5 | | Topdress N date | June 15 | June 8 | June 5 | | Harvest date | September 8 | August 16 | August 19 | | Soil test N, kg N ha−1 | 37.5 | 44.3 | 51.6 | | Soil P, ppm | 23 | 23 | 25 | | Soil K, ppm | 423 | 423 | 398 | | Organic matter, % | 2.9 | 2.9
Kalispell | 2.2 |
| | Herbicide | Bronate, Axial XL | Bronate, Axial XL | — | | Herbicide date | June 13 | May 28 | — | | Sensing date | June 15 | June 8 | — | | Topdress N date | June 15 | June 8 | — | | Harvest date | September 8 | August 16 | — | | Soil test N, kg N ha−1 | 37.5 | 44.3 | — | | Soil P, ppm | 23 | 23 | — | | Soil K, ppm | 423 | 425 | — | | Organic matter, % | 2.8 | 2.9 | — |
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